Ok,
so items are scanned in the order that you choose and the first one that match with current URL is applied. So, be sure to put /11 before of /1. Just two other suggestion:
1) Destination URL should include protocol and domain. You can use {siteurl} macro. So you should change, for example:
index.php?activeitem=1
With:
http://{siteurl}/index.php?activeitem=1
2) Tag Meta 1.1 supports the power regular expression, so just use it. For example to be sure that /11 don't mess with /1 insert FromURL in this way:
/1$ for /1
/11$ for /11
The dollar at the end means "terminate". More info on regex at:
dev.mysql.com/doc/refman/5.0/en/regexp.html
Regards,
Luigi